Rotator cuff tear Shoulder tendon tear
Conditions
Interventions
None listed
Sponsors
Leids Universitair Medisch Centrum
Eligibility
Age
18 Years to 99 Years
Inclusion criteria
Inclusion criteria: - Age: between 18 and 60 y.o. - No history of shoulder complaints - No current complaints of the shoulder
Exclusion criteria
Exclusion criteria: - No signed informed consent - Pace-maker or other electronic implants
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| * External force controlled Electromyography (EMG). To measure activation of individual shoulder muscles (in particular: deltoids, supraspinate, infraspinate, pectoralis major, upper and lower trapezius, latissimus dorsi and teres major) and analyze for relative changes in activation of rotator cuff and deltoid muscles with increased arm moment loading. Conditions: arm against an external force in 24 directions (humerus fixed in splint, constant exerted abduction force), 2 moment arms (~4 cm and ~29 cm from the glenohumeral joint). Outcome: Average filtered EMG value (rEMG), principal Action (PA), Activation Ratio (AR) and Max Voluntary Force (MVF), relative change in deltoid and supraspinate activation (rEMG) expressed in percentages. * 3D-Motion tracking of the scapular position during arm force task with the humerus in a fixed position. To record 3D kinematics of the scapula with a motion tracking system for analyzing the eventual change in scapular position as a result from changes in muscle activations when altering moment loading (with a constant force). Conditions: arm against an external force (humerus fixed in a splint, constant exerted force), 2 moment arms (~4 cm and ~29 cm from the glenohumeral joint). Outcome: 3D scapular positions (scapular posterior tilting, external rotation, and lateral rotation as described in literature) with altering moments and muscle activations. | — |
Secondary
| Measure | Time frame |
|---|---|
| Delft Shoulder and Elbow Model (DSEM) simulation Computer Model Analysis of the effect of increase in arm abduction moment loading (with the humerus in a fixed position and a constant exerted force) on relative increase of deltoid and supraspinate muscle activations. There is no extra effort of patients needed for these data. Conditions: Constant external abduction force on 2 separate distances from the glenohumeral joint (~4 and ~29 cm). Outcome: inversed dynamics (individual muscle forces, direction and magnitude of joint reaction forces). | — |
Countries
Netherlands
Outcome results
None listed